MP,

I bought mine from Amazon. Panasonic must of bought the rights from Sanyo.

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I also bought this charger after doing some research.

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They are lower in volts, 1.2.
I don't have a meter, so no help there.

I'm a little confused/ignorant about the idea of having more batteries than optimum you don't get any better run time but will still have considerable power in them?

My manual says between 10-20 volts. I was thinking about the run times Quentin was getting from that 18 volt lithium Ryobi drill battery and thought if I ran 12 x 1.2= 14.4, it would put me in that "sweet spot" longer.

I hooked it up and ran the finder in "simulator" mode just to see if I had things hooked up right.

Maybe when I get the charger, I'll let it run until it quits just to see how many hours I get.

If I turn off depth alarm and hung transducer in a bucket of water that should give me some idea of run time or maybe not?